Nodejs is so powerful that supports to build a wide range of applications such as live-streaming application, REST API, server-based web application, a real-time communication application, etc. However, Nodejs comprises numerous concepts that help in building multi-user network applications, web servers, similar to PHP, ASP.NET.
One should be aware of various concepts of Nodejs before going deeply into the development process:
Concepts Of Nodejs
Non-blocking is one of the important Concepts of Nodejs. One of the main operations of Nodejs is to handle browser requests as it is a server-side framework. In conventional input/output systems, the server blocks other or concurrent requests until the response (the HTML page) of the previous request has arrived.
This server blocking issues called blocking I/O. In order to process the current request, the browser has to wait in a rotating circle manner.
Unlike the traditional model, Nodejs doesn’t follow such kind of principle in Input/output system. If a request seems to take a longer time to load, Nodejs sends that particular request in an event loop. And such a request goes ahead to handle the next request in the call stack. As soon as the processing of pending requests done, Nodejs interferes to get the response on the browser.
The best feature of this particular system is that many objects can share the same methods on a prototype object. Each of which conserves memory and enables easy code reuse. And each prototype is a delegate object, which means that the property lookup which contains its own prototype.
Before commencing a new object, one must select an object that should be of its own prototype.
There are two types of modules in Nodejs concepts.
These are the modules that are pre-compiled with the Nodejs library. The main purpose of these core modules is to enable developers too often repeating code sections without this module, it results in a tough task for developers because they have to write the same code then. Some common core modules are HTTP, EVENTS, URL, FILE SYSTEM, etc.
In user-defined modules, the developer makes for a specific purpose in its application. These modules come into action when the core modules didn’t meet the required functionality.
Modules are extracts through the require function the argument possesses the same name of that module in the core module. But in the user-defined module, the argument is the path of that module in the file system.
When a callback function is passed as an argument to another function, only the function definition is passed. So, the timing of the callback function execution entirely depends on the calling function’s mechanism. This is the sole basis of the asynchronous or non-blocking behavior of the Nodejs framework.
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